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f6c826a9 | 1 | /* |
2 | * dbgp.c -- EHCI Debug Port device gadget | |
3 | * | |
4 | * Copyright (C) 2010 Stephane Duverger | |
5 | * | |
6 | * Released under the GPLv2. | |
7 | * | |
8 | */ | |
9 | ||
10 | /* verbose messages */ | |
11 | #include <linux/kernel.h> | |
12 | #include <linux/device.h> | |
13 | #include <linux/usb/ch9.h> | |
14 | #include <linux/usb/gadget.h> | |
15 | ||
16 | /* See comments in "zero.c" */ | |
17 | #include "epautoconf.c" | |
18 | ||
19 | #ifdef CONFIG_USB_G_DBGP_SERIAL | |
20 | #include "u_serial.c" | |
21 | #endif | |
22 | ||
23 | #define DRIVER_VENDOR_ID 0x0525 /* NetChip */ | |
24 | #define DRIVER_PRODUCT_ID 0xc0de /* undefined */ | |
25 | ||
26 | #define USB_DEBUG_MAX_PACKET_SIZE 8 | |
27 | #define DBGP_REQ_EP0_LEN 128 | |
28 | #define DBGP_REQ_LEN 512 | |
29 | ||
30 | static struct dbgp { | |
31 | struct usb_gadget *gadget; | |
32 | struct usb_request *req; | |
33 | struct usb_ep *i_ep; | |
34 | struct usb_ep *o_ep; | |
35 | #ifdef CONFIG_USB_G_DBGP_SERIAL | |
36 | struct gserial *serial; | |
37 | #endif | |
38 | } dbgp; | |
39 | ||
40 | static struct usb_device_descriptor device_desc = { | |
41 | .bLength = sizeof device_desc, | |
42 | .bDescriptorType = USB_DT_DEVICE, | |
43 | .bcdUSB = __constant_cpu_to_le16(0x0200), | |
44 | .bDeviceClass = USB_CLASS_VENDOR_SPEC, | |
45 | .idVendor = __constant_cpu_to_le16(DRIVER_VENDOR_ID), | |
46 | .idProduct = __constant_cpu_to_le16(DRIVER_PRODUCT_ID), | |
47 | .bNumConfigurations = 1, | |
48 | }; | |
49 | ||
50 | static struct usb_debug_descriptor dbg_desc = { | |
51 | .bLength = sizeof dbg_desc, | |
52 | .bDescriptorType = USB_DT_DEBUG, | |
53 | }; | |
54 | ||
55 | static struct usb_endpoint_descriptor i_desc = { | |
56 | .bLength = USB_DT_ENDPOINT_SIZE, | |
57 | .bDescriptorType = USB_DT_ENDPOINT, | |
58 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
59 | .bEndpointAddress = USB_DIR_IN, | |
60 | }; | |
61 | ||
62 | static struct usb_endpoint_descriptor o_desc = { | |
63 | .bLength = USB_DT_ENDPOINT_SIZE, | |
64 | .bDescriptorType = USB_DT_ENDPOINT, | |
65 | .bmAttributes = USB_ENDPOINT_XFER_BULK, | |
66 | .bEndpointAddress = USB_DIR_OUT, | |
67 | }; | |
68 | ||
69 | #ifdef CONFIG_USB_G_DBGP_PRINTK | |
70 | static int dbgp_consume(char *buf, unsigned len) | |
71 | { | |
72 | char c; | |
73 | ||
74 | if (!len) | |
75 | return 0; | |
76 | ||
77 | c = buf[len-1]; | |
78 | if (c != 0) | |
79 | buf[len-1] = 0; | |
80 | ||
81 | printk(KERN_NOTICE "%s%c", buf, c); | |
82 | return 0; | |
83 | } | |
84 | ||
85 | static void __disable_ep(struct usb_ep *ep) | |
86 | { | |
87 | if (ep && ep->driver_data == dbgp.gadget) { | |
88 | usb_ep_disable(ep); | |
89 | ep->driver_data = NULL; | |
90 | } | |
91 | } | |
92 | ||
93 | static void dbgp_disable_ep(void) | |
94 | { | |
95 | __disable_ep(dbgp.i_ep); | |
96 | __disable_ep(dbgp.o_ep); | |
97 | } | |
98 | ||
99 | static void dbgp_complete(struct usb_ep *ep, struct usb_request *req) | |
100 | { | |
101 | int stp; | |
102 | int err = 0; | |
103 | int status = req->status; | |
104 | ||
105 | if (ep == dbgp.i_ep) { | |
106 | stp = 1; | |
107 | goto fail; | |
108 | } | |
109 | ||
110 | if (status != 0) { | |
111 | stp = 2; | |
112 | goto release_req; | |
113 | } | |
114 | ||
115 | dbgp_consume(req->buf, req->actual); | |
116 | ||
117 | req->length = DBGP_REQ_LEN; | |
118 | err = usb_ep_queue(ep, req, GFP_ATOMIC); | |
119 | if (err < 0) { | |
120 | stp = 3; | |
121 | goto release_req; | |
122 | } | |
123 | ||
124 | return; | |
125 | ||
126 | release_req: | |
127 | kfree(req->buf); | |
128 | usb_ep_free_request(dbgp.o_ep, req); | |
129 | dbgp_disable_ep(); | |
130 | fail: | |
131 | dev_dbg(&dbgp.gadget->dev, | |
132 | "complete: failure (%d:%d) ==> %d\n", stp, err, status); | |
133 | } | |
134 | ||
135 | static int dbgp_enable_ep_req(struct usb_ep *ep) | |
136 | { | |
137 | int err, stp; | |
138 | struct usb_request *req; | |
139 | ||
140 | req = usb_ep_alloc_request(ep, GFP_KERNEL); | |
141 | if (!req) { | |
142 | err = -ENOMEM; | |
143 | stp = 1; | |
144 | goto fail_1; | |
145 | } | |
146 | ||
147 | req->buf = kmalloc(DBGP_REQ_LEN, GFP_KERNEL); | |
148 | if (!req->buf) { | |
149 | err = -ENOMEM; | |
150 | stp = 2; | |
151 | goto fail_2; | |
152 | } | |
153 | ||
154 | req->complete = dbgp_complete; | |
155 | req->length = DBGP_REQ_LEN; | |
156 | err = usb_ep_queue(ep, req, GFP_ATOMIC); | |
157 | if (err < 0) { | |
158 | stp = 3; | |
159 | goto fail_3; | |
160 | } | |
161 | ||
162 | return 0; | |
163 | ||
164 | fail_3: | |
165 | kfree(req->buf); | |
166 | fail_2: | |
167 | usb_ep_free_request(dbgp.o_ep, req); | |
168 | fail_1: | |
169 | dev_dbg(&dbgp.gadget->dev, | |
170 | "enable ep req: failure (%d:%d)\n", stp, err); | |
171 | return err; | |
172 | } | |
173 | ||
174 | static int __enable_ep(struct usb_ep *ep, struct usb_endpoint_descriptor *desc) | |
175 | { | |
176 | int err = usb_ep_enable(ep, desc); | |
177 | ep->driver_data = dbgp.gadget; | |
178 | return err; | |
179 | } | |
180 | ||
181 | static int dbgp_enable_ep(void) | |
182 | { | |
183 | int err, stp; | |
184 | ||
185 | err = __enable_ep(dbgp.i_ep, &i_desc); | |
186 | if (err < 0) { | |
187 | stp = 1; | |
188 | goto fail_1; | |
189 | } | |
190 | ||
191 | err = __enable_ep(dbgp.o_ep, &o_desc); | |
192 | if (err < 0) { | |
193 | stp = 2; | |
194 | goto fail_2; | |
195 | } | |
196 | ||
197 | err = dbgp_enable_ep_req(dbgp.o_ep); | |
198 | if (err < 0) { | |
199 | stp = 3; | |
200 | goto fail_3; | |
201 | } | |
202 | ||
203 | return 0; | |
204 | ||
205 | fail_3: | |
206 | __disable_ep(dbgp.o_ep); | |
207 | fail_2: | |
208 | __disable_ep(dbgp.i_ep); | |
209 | fail_1: | |
210 | dev_dbg(&dbgp.gadget->dev, "enable ep: failure (%d:%d)\n", stp, err); | |
211 | return err; | |
212 | } | |
213 | #endif | |
214 | ||
215 | static void dbgp_disconnect(struct usb_gadget *gadget) | |
216 | { | |
217 | #ifdef CONFIG_USB_G_DBGP_PRINTK | |
218 | dbgp_disable_ep(); | |
219 | #else | |
220 | gserial_disconnect(dbgp.serial); | |
221 | #endif | |
222 | } | |
223 | ||
224 | static void dbgp_unbind(struct usb_gadget *gadget) | |
225 | { | |
226 | #ifdef CONFIG_USB_G_DBGP_SERIAL | |
227 | kfree(dbgp.serial); | |
228 | #endif | |
229 | if (dbgp.req) { | |
230 | kfree(dbgp.req->buf); | |
231 | usb_ep_free_request(gadget->ep0, dbgp.req); | |
232 | } | |
233 | ||
234 | gadget->ep0->driver_data = NULL; | |
235 | } | |
236 | ||
237 | static int __init dbgp_configure_endpoints(struct usb_gadget *gadget) | |
238 | { | |
239 | int stp; | |
240 | ||
241 | usb_ep_autoconfig_reset(gadget); | |
242 | ||
243 | dbgp.i_ep = usb_ep_autoconfig(gadget, &i_desc); | |
244 | if (!dbgp.i_ep) { | |
245 | stp = 1; | |
246 | goto fail_1; | |
247 | } | |
248 | ||
249 | dbgp.i_ep->driver_data = gadget; | |
250 | i_desc.wMaxPacketSize = | |
251 | __constant_cpu_to_le16(USB_DEBUG_MAX_PACKET_SIZE); | |
252 | ||
253 | dbgp.o_ep = usb_ep_autoconfig(gadget, &o_desc); | |
254 | if (!dbgp.o_ep) { | |
255 | dbgp.i_ep->driver_data = NULL; | |
256 | stp = 2; | |
257 | goto fail_2; | |
258 | } | |
259 | ||
260 | dbgp.o_ep->driver_data = gadget; | |
261 | o_desc.wMaxPacketSize = | |
262 | __constant_cpu_to_le16(USB_DEBUG_MAX_PACKET_SIZE); | |
263 | ||
a8779ee9 SS |
264 | dbg_desc.bDebugInEndpoint = i_desc.bEndpointAddress; |
265 | dbg_desc.bDebugOutEndpoint = o_desc.bEndpointAddress; | |
f6c826a9 | 266 | |
267 | #ifdef CONFIG_USB_G_DBGP_SERIAL | |
268 | dbgp.serial->in = dbgp.i_ep; | |
269 | dbgp.serial->out = dbgp.o_ep; | |
270 | ||
271 | dbgp.serial->in_desc = &i_desc; | |
272 | dbgp.serial->out_desc = &o_desc; | |
273 | ||
274 | if (gserial_setup(gadget, 1) < 0) { | |
275 | stp = 3; | |
276 | goto fail_3; | |
277 | } | |
278 | ||
279 | return 0; | |
280 | ||
281 | fail_3: | |
282 | dbgp.o_ep->driver_data = NULL; | |
283 | #else | |
284 | return 0; | |
285 | #endif | |
286 | fail_2: | |
287 | dbgp.i_ep->driver_data = NULL; | |
288 | fail_1: | |
289 | dev_dbg(&dbgp.gadget->dev, "ep config: failure (%d)\n", stp); | |
290 | return -ENODEV; | |
291 | } | |
292 | ||
293 | static int __init dbgp_bind(struct usb_gadget *gadget) | |
294 | { | |
295 | int err, stp; | |
296 | ||
297 | dbgp.gadget = gadget; | |
298 | ||
299 | dbgp.req = usb_ep_alloc_request(gadget->ep0, GFP_KERNEL); | |
300 | if (!dbgp.req) { | |
301 | err = -ENOMEM; | |
302 | stp = 1; | |
303 | goto fail; | |
304 | } | |
305 | ||
306 | dbgp.req->buf = kmalloc(DBGP_REQ_EP0_LEN, GFP_KERNEL); | |
307 | if (!dbgp.req->buf) { | |
308 | err = -ENOMEM; | |
309 | stp = 2; | |
310 | goto fail; | |
311 | } | |
312 | ||
313 | dbgp.req->length = DBGP_REQ_EP0_LEN; | |
314 | gadget->ep0->driver_data = gadget; | |
83b72019 | 315 | device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket; |
f6c826a9 | 316 | |
317 | #ifdef CONFIG_USB_G_DBGP_SERIAL | |
318 | dbgp.serial = kzalloc(sizeof(struct gserial), GFP_KERNEL); | |
319 | if (!dbgp.serial) { | |
320 | stp = 3; | |
321 | err = -ENOMEM; | |
322 | goto fail; | |
323 | } | |
324 | #endif | |
325 | err = dbgp_configure_endpoints(gadget); | |
326 | if (err < 0) { | |
327 | stp = 4; | |
328 | goto fail; | |
329 | } | |
330 | ||
331 | dev_dbg(&dbgp.gadget->dev, "bind: success\n"); | |
332 | return 0; | |
333 | ||
334 | fail: | |
335 | dev_dbg(&gadget->dev, "bind: failure (%d:%d)\n", stp, err); | |
336 | dbgp_unbind(gadget); | |
337 | return err; | |
338 | } | |
339 | ||
340 | static void dbgp_setup_complete(struct usb_ep *ep, | |
341 | struct usb_request *req) | |
342 | { | |
343 | dev_dbg(&dbgp.gadget->dev, "setup complete: %d, %d/%d\n", | |
344 | req->status, req->actual, req->length); | |
345 | } | |
346 | ||
347 | static int dbgp_setup(struct usb_gadget *gadget, | |
348 | const struct usb_ctrlrequest *ctrl) | |
349 | { | |
350 | struct usb_request *req = dbgp.req; | |
351 | u8 request = ctrl->bRequest; | |
352 | u16 value = le16_to_cpu(ctrl->wValue); | |
353 | u16 length = le16_to_cpu(ctrl->wLength); | |
1744020c SS |
354 | int err = -EOPNOTSUPP; |
355 | void *data = NULL; | |
356 | u16 len = 0; | |
f6c826a9 | 357 | |
358 | gadget->ep0->driver_data = gadget; | |
359 | ||
360 | if (request == USB_REQ_GET_DESCRIPTOR) { | |
361 | switch (value>>8) { | |
362 | case USB_DT_DEVICE: | |
363 | dev_dbg(&dbgp.gadget->dev, "setup: desc device\n"); | |
364 | len = sizeof device_desc; | |
365 | data = &device_desc; | |
366 | break; | |
367 | case USB_DT_DEBUG: | |
368 | dev_dbg(&dbgp.gadget->dev, "setup: desc debug\n"); | |
369 | len = sizeof dbg_desc; | |
370 | data = &dbg_desc; | |
371 | break; | |
372 | default: | |
373 | goto fail; | |
374 | } | |
1744020c | 375 | err = 0; |
f6c826a9 | 376 | } else if (request == USB_REQ_SET_FEATURE && |
377 | value == USB_DEVICE_DEBUG_MODE) { | |
f6c826a9 | 378 | dev_dbg(&dbgp.gadget->dev, "setup: feat debug\n"); |
379 | #ifdef CONFIG_USB_G_DBGP_PRINTK | |
380 | err = dbgp_enable_ep(); | |
381 | #else | |
382 | err = gserial_connect(dbgp.serial, 0); | |
383 | #endif | |
384 | if (err < 0) | |
385 | goto fail; | |
386 | } else | |
387 | goto fail; | |
388 | ||
c6a76781 DC |
389 | req->length = min(length, len); |
390 | req->zero = len < req->length; | |
391 | if (data && req->length) | |
392 | memcpy(req->buf, data, req->length); | |
393 | ||
394 | req->complete = dbgp_setup_complete; | |
395 | return usb_ep_queue(gadget->ep0, req, GFP_ATOMIC); | |
f6c826a9 | 396 | |
397 | fail: | |
398 | dev_dbg(&dbgp.gadget->dev, | |
399 | "setup: failure req %x v %x\n", request, value); | |
400 | return err; | |
401 | } | |
402 | ||
403 | static struct usb_gadget_driver dbgp_driver = { | |
404 | .function = "dbgp", | |
405 | .speed = USB_SPEED_HIGH, | |
f6c826a9 | 406 | .unbind = dbgp_unbind, |
407 | .setup = dbgp_setup, | |
408 | .disconnect = dbgp_disconnect, | |
409 | .driver = { | |
410 | .owner = THIS_MODULE, | |
411 | .name = "dbgp" | |
412 | }, | |
413 | }; | |
414 | ||
415 | static int __init dbgp_init(void) | |
416 | { | |
b0fca50f | 417 | return usb_gadget_probe_driver(&dbgp_driver, dbgp_bind); |
f6c826a9 | 418 | } |
419 | ||
420 | static void __exit dbgp_exit(void) | |
421 | { | |
422 | usb_gadget_unregister_driver(&dbgp_driver); | |
423 | #ifdef CONFIG_USB_G_DBGP_SERIAL | |
424 | gserial_cleanup(); | |
425 | #endif | |
426 | } | |
427 | ||
428 | MODULE_AUTHOR("Stephane Duverger"); | |
429 | MODULE_LICENSE("GPL"); | |
430 | module_init(dbgp_init); | |
431 | module_exit(dbgp_exit); |